我们可以为python中的一个变量赋值吗？

Question

I have the below python code. I am unable to understand that how the result prints the x value as true, and the Z value as false. And a as 11 and b as 10.

x = (1 == True)  
y = (2 == False)  
z = (3 == True)  
a = True + 10  
b = False + 10  

print("x is", x)  
print("y is", y)  
print("z is", z)  
print("a:", a)  
print("b:", b)  

Answer 1

Let's see what True and False are made of

>>> type(True)
<class 'bool'>
>>> type(False)
<class 'bool'>
>>> bool.__bases__
(<class 'int'>,)

True and False are bool type which itself is a specialization of int . And they behave like the integers 1 and 0.

>>> int(True)
1
>>> int(False)
0

But unlike regular variables, you can't assign anything to them. That's because they are also python language Keywords and the compiler won't allow the names "True" and "False" to be variables.

>>> True = 10
  File "<stdin>", line 1
SyntaxError: cannot assign to True
>>> 

In your examples, True is 1 and False is 0 , so

This...       is the same as...  resulting in...
1 == True     1 == 1             True
2 == False    2 == 1             False
3 == True     3 == 1             False  
True + 10     1 + 10             11  
False + 10    0 + 10             10 

Answer 2

In python, True = 1, False = 0, so x=(1==True) means x = True if 1==1 else False.

For z, z=(3==True) means z=(3==1). 3 doesn't equal 1, so z = False.

For a, a=True+10 means a = 1+10=11. For b, b=False+10 means b=0+10=10.